1. Introduction 2. Ruthenium(II) complexesfor anion sensing 2.1 Pyrrole-based Ru(II) complexes as chemosensors 2.2 Imidazole-based Ru(II) complexes as chemosensors 2.3 Urea-based Ru(II) complexes as chemosensors 2.4 Sulfonamide-based Ru(II) complexes as chemosensors 3. Rhenium(I) complexesfor anion sensing 3.1 Amide-based Re(I) complexes as chemosensors 3.2 Thioamide-and thiourea-based Re(I) complexes as chemosensors 3.3 Sulfonamide-based Re(I) complexes as chemosensors 3.4 Acetylamino-and trifluoroacetylamino-based Re(I) complexes as chemosensors 3.5 Catecholamide-based Re(I) complexes as chemosensors 4. Iridium(III) complexes for anion sensing 4.1 Thiourea-based Ir(III) complexes as chemosensors 4.2 Imidazole-based Ir(III) complexes as chemosensors 5. Concluding remarks Acknowledgements References

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